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Do not attempt to autolaunch a session dbus-daemon with no DISPLAY

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The two known use-cases for autolaunching are:

* X-forwarding: "ssh -Y myhost myapp" resulting in a
  session bus on myhost but an X server on the original host

* Legacy desktop environments on OSs without D-Bus integration:
  e.g. running a single GNOME or KDE app under fvwm or something,
  without a session dbus-daemon being started by either systemd,
  gnome-session, or OS integration scripts analogous to Debian's
  /etc/X11/Xsession.d/75dbus_dbus-launch

In either case, an X11 DISPLAY is also needed.

"dbus-launch --autolaunch" doesn't do anything useful when unable
to connect to an X11 display; this has been the case since the feature
was added in 2006, and is useful to avoid "split brain" situations in
which two processes that ought to be part of the same session end up
on separate session buses. Since dbus commit 407c111 in 2011,
libdbus hasn't even attempted to run "dbus-launch --autolaunch"
unless getenv("DISPLAY") returns non-null in the parent: this avoids
doing a relatively complicated fork-and-exec that is clearly not
going to lead to success. This commit gives GDBus the same policy.

This change was originally made to work around a race condition in
subprocess spawning (Debian bug #737380, GNOME bug #711090) but
it seems valid in its own right.

In my opinion as D-Bus maintainer, "dbus-launch --autolaunch" should
be considered to be an X11 feature, and any future D-Bus enhancements
(e.g. kdbus) or successors for X11 (e.g. Wayland, Mir) should obtain
a session bus address by other means - either a session manager
such as "systemd --user", gnome-session or Upstart, or a wrapper
for the user session like dbus-run-session(1).

Related to dbus bug <https://bugs.freedesktop.org/show_bug.cgi?id=19997>.

Bug: https://bugzilla.gnome.org/show_bug.cgi?id=723506
Bug-Debian: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=737380
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
This commit is contained in:
Simon McVittie 2014-02-03 01:14:45 +00:00 committed by Matthias Clasen
parent 69a2c70174
commit 0f2e4fd01c
1 changed files with 7 additions and 0 deletions
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7
gio/gdbusaddress.c
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@ -1072,6 +1072,13 @@ get_session_address_dbus_launch (GError **error)
goto out; goto out;
} }
if (g_getenv ("DISPLAY") == NULL)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
_("Cannot autolaunch D-Bus without X11 $DISPLAY"));
goto out;
}
/* We're using private libdbus facilities here. When everything /* We're using private libdbus facilities here. When everything
* (X11, Mac OS X, Windows) is spec'ed out correctly (not even the * (X11, Mac OS X, Windows) is spec'ed out correctly (not even the
* X11 property is correctly documented right now) we should * X11 property is correctly documented right now) we should